I've installed Ubuntu 12.04 LTS on my Acer Aspire One (netbook) with the help of wubi. The installation went fine, but after logging in my screen resolution was wrong. Because of that the desktop and all the windows were displayed incorrectly. Also, because of this I couldn't change the resolution to a normal setting. I rebooted and now the display is black. I can here the boot process is going normally and after the beep I can log in correctly (but I can't see a thing). How can I change the resolution to a normal setting?
PS: the screen isn't broken, the netbook has a dual install and in Windows Vista everything is working properly.